Novel track layer for urban track traffic engineering and its construction method

ABSTRACT

It relates to the engineering technology science, in particular to a novel track layer for urban rail traffic engineering and its construction method. The novel track layer comprises lifting and walking trolleys, a connecting truss beam, a track running mechanism and a supporting structure. Horizontal extending and vertical supporting structures of each lifting and walking trolley are operated firstly so as to lift the whole novel track layer to a height at which a track material is hoisted and unloaded. A hoisting car is used to lift up the track material to leave from a flat trunk and a material supporting cushion. The novel track layer continues to walk forward to a designed mounting position of a track section, and then the track material is unloaded. Steel tracks are connected and a temporary track section support is mounted to fix a newly mounted track section.

TECHNICAL FIELD

The present invention relates to engineering technology science, in particular to a novel track layer for urban track traffic engineering and its construction method.

BACKGROUND ART

At present, in the track construction of urban track transit engineering in China, track layer equipment mainly includes three types: a fixedly assembled door type structure, a manual and hydraulic fixed-distance variable-span door type structure and an automatically retrieved electric stepless variable-span door type structure. Temporary running tracks need to be layed for the three types of track layers to run. The temporary running tracks are pre-layed on tunnel sidewalls on both sides of a main line or a structure floor, with track distances being generally 2800 mm, 3000 mm, 3100 mm, 3800 mm, etc. The temporary running tracks are fixed on the tunnel sidewalls or the structural floor by special steel structural buttresses. Due to the narrow space of an underground tunnel structure of urban track transit engineering, the mounting of the temporary running tracks reduces a working space in the narrow space. The laying of track sections during the track construction requires the use of lateral supports to ensure the state of the track. The lateral supports often collide with the temporary running tracks, which reduces the construction space for track section laying on the main line. The position where the temporary running tracks are mounted is different depending on the difference in structure of the tunnel (a circular tunnel is mounted on the side wall, a horseshoe tunnel and a rectangular tunnel are mounted on the structural floor, or one side of a structure needs to be mounted on the sidewall and the other side thereof needs to be mounted on the structure floor). No matter what kind of mounting method is adopted, the position space of the track bed structure will be occupied, such that the concrete construction of a track bed is changed from completed at a time to constructed twice (the entire track bed is poured first and a track bed ditch is poured later), resulting in the formation of concrete structural joints between the entire track bed and the ditch. As the laying of the main line track continues to advance forward, a large number of temporary running tracks are circularly transported and used, which makes the construction of the main line track have an impact both in space and in time. In the meantime, a building structure needs to be drilled with holes to fix running track buttresses when the temporary running tracks are mounted, which affects the appearance and performance of the structure to some extent. When encountering special sections such as stations and civil air defense doors, due to the limitation of structural boundaries, the change in track distances of the temporary running tracks causes the discontinuity of the temporary running tracks, which not only occupies the mounting position of the main line track, but also interrupts the construction of the main line track due to the span change requirements of the track layer, thereby occupying the effective time and space of the track construction to varying degrees. Due to the need to lay the temporary running tracks, the operation procedures are increased for the construction of the main line track, the construction investment is increased, and the construction cost and labor intensity are increased.

In summary, the existing track layer for track construction is widely used in practical applications, but it brings many constraints and influences to the construction of the main line. In the rapid development of the laying construction technology of modern track transit engineering, the structures, such as a plate type track bed and a prefabricated assembly structure will become the mainstreams. In order to meet the higher requirements on track laying construction efficiency, there are higher requirements on the adaptability, full-featured type and flexibility of track laying equipment, and it is an inevitable trend to provide larger working space and effective working time for track laying on the main line. Therefore, it is a necessary trend and urgent affair to develop a novel energy-saving and environmentally-friendly track layer that can realize the hoisting and transfer of track materials, prefabricated products, assembled structures and other materials in the tunnel without the need to lay temporary running tracks, as well as rapid transfer of the whole machine without disintegration, and the long-distance transportation and transfer just by simple splitting.

SUMMARY OF THE INVENTION

An objective of the present invention is to design a novel track layer for urban track traffic engineering and its construction method in order to solve the problem that an auxiliary procedure in which temporary running tracks need to be layed on both sides of a main line in the current track construction, and meantime to improve the transportation efficiency and safety. The track layer for urban track transit engineering comprises lifting and walking trolleys, a connecting truss beam, crawler running mechanisms and supporting structures, wherein the novel track layer consists of two lifting and walking trolleys and a connecting truss beam connecting the two lifting and walking trolleys; each lifting and walking trolley consists of a running car, and a horizontal frame beam for the running car to move longitudinally; the supporting structure capable of horizontally extending to both sides of a main line track and having the vertical lifting and walking trolley is mounted at the front and rear ends of the horizontal frame beam respectively; each running car consists of a frame structure, track running wheels, and the crawler running mechanism mounted in the center of a planar frame structure of the running car; the novel track layer walks on the main line track through the track walking wheels in a section having the main line track, and walks on a structural floor through the crawler running mechanisms in a section free of the main line track; each horizontally extendable and vertically liftable supporting structure is used for the switching of the novel track layer between the section having the main line track and the section free of the main line track.

A latch hook by which the novel track layer and a towing vehicle are connected is mounted outside the horizontal frame beam; a hydraulic pump station and a power supply cable reel which are used for hydraulic operation of each lifting and walking trolley are mounted on an upper reinforcing structure frame of the horizontal frame beam; the two lifting and walking trolleys are connected by the connecting truss beam together to form a complete machine; a hoisting car for hoisting materials is mounted on the connecting truss beam; the hoisting car is towed by a windlass to walk back and forth along the truss beam to achieve precise lifting and positioning of track materials.

The horizontal frame beam consists of a plurality of longitudinal beams, a plurality of crossbeams and an upper reinforcing structure; each longitudinal beam acts both as a structural beam of the horizontal frame beam and as a guide column for the running car to move back and forth; each crossbeam acts both as a structural beam of the horizontal frame beam and as a guide sleeve structure for a vertical supporting structure of the lifting and walking trolley to extend horizontally and laterally; a reinforcing structure is mounted on the upper part of the horizontal frame beam to ensure the longitudinal rigidity and the lateral rigidity of the horizontal frame beam; a horizontal extension mechanism perpendicular to a line direction is mounted in each crossbeam; each horizontal extension mechanism consists of a guide column and a vertical guide sleeve; the horizontal extension mechanisms cooperate by means of the guide columns and the guide sleeve structures; horizontal and lateral extension is achieved by a hydraulic drive cylinder; the vertical supporting structure consisting of a second guide column, a first guide column and a first hydraulic drive cylinder is mounted in each guide column, wherein the second guide column acts as a guide sleeve of the first guide column; the vertical supporting structure is realized in such a manner that the first hydraulic drive cylinder drives the first guide column and the second guide column to extend step by step.

The running car consists of a frame structure, track running wheels and a crawler running mechanism mounted in the center of a planer frame structure of the running car; the frame structure consists of two guide sleeves, track running wheels and a connection structure component; the running car is sleeved on the horizontal frame beam of the lifting and walking trolley through the guide sleeves; forward and backward movements of the running car along the horizontal frame beam is achieved by a second hydraulic drive cylinder; the track running wheels of the running car are driven by a motor to walk on the main line track; the crawler running mechanism is mounted in the center of the upper plane of the running car and is fixed on a lower structural floor of the running car through a rotary disk; the crawler running mechanism extends upwards and downwards through the guide sleeve and the guide column; the extendable guide sleeve is fixed on the rotary disk; a steering drive ball pin is mounted on the upper plane of the rotary disk; upward and downward extension of the guide column is achieved by a third hydraulic drive cylinder; the crawler running mechanism is connected with the guide column through a pin shaft; the crawler running mechanism consists of a chassis, a driving wheel, a guide wheel, a thrust wheel, a towing wheel and a crawler, and a hydraulic drive motor; a rotating disk capable of rotating around the center of the running car is further mounted on the upper plane of the running car; the rotating disk rotates around the center of the car through a roller; a hinging base is mounted on the rotating disk and is connected to the connecting truss beam through a hinge pin.

The connecting truss beam is formed by welding steel tubes, is divided into three sections and has a cross-section shaped as a Chinese character “Yi” (chair) and is arranged symmetrically in left and right sides; the three sections are connected by connecting pins; a track for the hoisting car to walk is mounted on the connecting truss beam; a windlass and a pulley block are mounted at two ends of the connecting truss beam and used for towing the hoisting car to move back and forth along the track; a hydraulically driven hydraulic pump station and a cable reel are mounted on the upper reinforcing structure of the horizontal frame beam of the hoisting and walking trolley and used for providing hydraulic pressure and electric power for the novel track layer.

The construction method for the track layer comprises the following steps: when the novel track layer unloads a track section from a track section truck, operating horizontally extendable and vertical supporting structures of each lifting and walking trolley firstly so as to lift the whole novel track layer to a height at which a track material is hoisted and unloaded; pushing a flat truck that transports the track material to a position under the connecting truss beam of the novel track layer; lifting up the track material by the hoisting car to leave from the flat trunk and a material supporting cushion; enabling the flat truck to exit from the position below the novel track layer; operating the vertical supporting structure of the lifting and walking trolley to enable the novel track layer to descend together with the track material, such that the running car of the novel track layer falls on the main line track stably to finish unloading; when the novel track layer walks to the vicinity of a mounting position along the main line track and the front lifting and walking trolley arrives at a gear at the end of the main line track, operating the vertical supporting structure of the lifting and walking trolley to make the running car away from the track; operating a longitudinal movement control device of the lifting and walking trolley to move the running car out of the main line track; operating a crawler running control device to lower the crawler running mechanism and to be supported on the structural floor; recovering a lifting mechanism to an initial retraction position; enabling the novel track layer to continue to walk forward to a designed mounting position of the track section, and then unloading the track material; connecting steel rails and mounting a temporary track section support to fix a newly mounted track section; reversely operating control devices for lifting, mechanism switching and longitudinal movement of the novel track layer to return the novel track layer to the main line track; enabling the track layer to continue to walk towards a track section hoisting position in next time to arrive at an unloading place; and hoisting the track section to the next cycle

The specific construction method is as follows:

A. lapping, hoisting and transporting works of track sections

(1) operating the novel track layer to a track section unloading position; operating horizontally extendable vertical supporting structures of the No. 1 lifting and walking trolley and the No. 2 lifting and walking trolley respectively to make the vertical supports to extend to two sides of a line, with an extension distance satisfying the width and safety distance requirements of the flat truck for track section transportation and the loaded material; and performing a locking operation after the safety is ensured;

(2) operating the horizontally extendable vertical supporting structures of the No. 1 lifting and walking trolley and the No. 2 lifting and walking trolley respectively to make the vertical supports to extend downwards; enabling a lower support foot plate of each vertical support to be stably supported on the track bed that has reached a desired strength, or the structural floor, and ensuring the force to be distributed uniformly; synchronously continuing to operate the horizontally extendable vertical supporting structures of the No. 1 lifting and walking trolley and the No. 2 lifting and walking trolley respectively to make the vertical supports continuously extend downwards; since the counteraction of the support from the floor makes the No. 1 lifting and walking trolley and the No. 2 lifting and walking trolley and the connecting hoisting truss beam to lift slowly upwards, stopping operating after the hoisting height is reached, re-checking whether the vertical supporting structures of the lifting and walking trolleys are stably supported and stressed uniformly, and then locking;

(3) directing a track towing vehicle to push the flat truck that transports the track material to slowly enter a position under the novel track layer, and stopping pushing and performing parking brake when the track section completely enters the space under the connecting hoisting truss beam;

(4) operating hoisting cars on the crossbeams of the connecting truss beam of the novel track layer respectively to be aligned to hoisting-point positions at which the track material is hoisted; lowering a hoisting carrying-pole to connect a hook and the track section; operating the hoisting cars respectively such that they are stressed at hoisting points; re-checking vertical support feet of the novel track layer to ensure that they are firm; synchronously operating the hoisting cars to hoist the track material slowly; stopping lifting after the track material is completely detached from the fulcrum on a bogie supporting structure on the flat truck by a safety distance, and performing a locking operation; starting the track towing vehicle to make it tow the flat truck slowly to drive away from the new track layer by a certain distance, and then stopping or returning to a base for transportation of the next track section;

(5) synchronously operating the horizontally extendable vertical supporting structures of the No. 1 and No. 2 lifting and walking trolleys reversely such that the vertical supports retract upwards, so that the No. 1 and No. 2 lifting and walking trolleys in this case descend to the main line track slowly together with the connecting truss beam and the hoisted track material; continuously operating the horizontally extendable vertical supporting structures of the No. 1 and No. 2 lifting and walking trolleys reversely such that the vertical supports retract upwards and return to a transfer state of the novel track layer; performing a locking operation; adjusting the horizontally extendable vertical supporting structures of the No. 1 and No. 2 lifting and walking trolleys, such that a distance between the vertical support feet having the unified cross-section is greater than the width of the track material;

(6) operating a running device control system of the novel track layer such that the novel track layer hoists the track material to run to a designed mounting position along the main line track, and the novel track layer hoists the track material to pass through a section at which concrete pouring has been completed, a section at which no concentrate is poured and a section at which the track section is adjusted and fixed, and arrives at the end of the main line track;

(7) stopping running when the running car of the No. 2 lifting and walking trolley of the novel track layer arrives at a gear position at the end of the main line track;

B. running mechanism switching, moving and track section positioning works of the novel track layer

(1) when the running car of the No. 2 lifting and walking trolley of the novel track layer arrives at a gear at the end of the main line track and stops running, operating a longitudinal movement control device of the running vehicle of the No. 2 lifting and walking trolley, such that the horizontal frame structure of the lifting and walking trolley moves to a horizontal movement stop position relative to the running car in a direction in which no main line track is arranged, and stopping operating;

(2) operating the horizontally extendable vertical supporting structure of the No. 2 lifting and walking trolley to extend downward; enabling a lower support foot plate of the horizontally extendable vertical support to be stably supported on the structural floor, and ensuring the force to be distributed uniformly; continuing to operate the running car of the No. 2 lifting and walking trolley to lift upwards away from the tread of the main line track and to be higher than a gear height; then stopping lifting, and locking;

(3) synchronously operating a running car running drive device of the No. 1 lifting and walking trolley and a running wheel longitudinally movable control device of the No. 2 lifting and walking trolley, such that the No. 1 lifting and walking trolley, the connecting truss beam, the track material and the running car of the No. 2 lifting and walking trolley move in a direction in which no main line track is arranged; stopping operating when they arrive at a running car longitudinally movable stop position of the No. 2 lifting and walking trolley; locking such that a horizontal projection of the running car is completely out of the main line track;

(4) operating a crawler running mechanism lifting device in the running car of the No. 2 lifting and walking trolley, such that the crawler running mechanism descends slowly and is stably supported on the structural floor and stressed;

(5) operating the horizontally extendable vertical supporting structure of the No. 2 lifting and walking trolley, such that the horizontally extendable vertical supporting structure is completely separated from the structural floor by a certain height, then stopping operating, and locking;

(6) synchronously operating the running car running control device of the No. 1 lift and walking trolley and the crawler running control device of the No. 2 lift and walking trolley, such that the novel track layer runs in a direction in which no main line track is arranged; operating a crawler running direction control device of the No. 2 lifting and walking trolley to adjust a running direction of the No. 2 lifting and walking trolley and to ensure that the No. 2 lifting and walking trolley walks on the central line of the track; when the No. 1 lifting and walking trolley approaches to the end of the main line track, stopping running; checking the horizontal projection position of the track section and the connected position of the end of the mounted track section; completing alignment by moving the hoisting car if there is a little deviation in position, or completing alignment by moving the novel track layer if there is a great deviation;

(7) synchronously operating the hoisting car to lower the track section slowly to a designed mounting height; moving the hoisting car back and forth slightly; stopping operating after the newly mounted track section is aligned to the mounted track section;

(8) fixedly connecting joints of steel rails with a steel rail splint; mounting a temporary support or a track state adjusting frame at a set position on the track section; screwing up an adjusting nut to fix a spatial position of the newly mounted track section;

(9) operating a hoisting control device; disconnecting the hoisting carrying-pole from the track section; hoisting the hoisting carrying-pole to an upper limit position, and then stopping operating;

C. running mechanism switching of the novel track layer to lapping and hoisting position

(1) operating the novel track layer to run in a direction of the main line track, and stopping running when the end surface of the running crawler approaches to the end of the newly mounted track section;

(2) operating the running car longitudinally movable control device of the No. 2 lifting and walking trolley, such that the horizontal frame structure of the lifting and walking trolley moves to a longitudinal movement stop position relative to the running car in a direction of the main line track, and stopping operating;

(3) operating the horizontally extendable vertical supporting structure of the No. 2 lifting and walking trolley to extend downward; enabling the lower support foot plate of the horizontally extendable vertical supporting structure to be stably supported on the structural floor, and ensuring the force to be distributed uniformly; continuing to operate the running car of the No. 2 lifting and walking trolley to lift upwards to be higher than a gear height; then stopping lifting, and locking;

(4) operating the crawler running mechanism lifting device in the running car of the No. 2 lifting and walking trolley, such that the crawler running mechanism lifts slowly and is stably retracted at an upper limit position inside the running car; stopping operating, and locking;

(5) synchronously operating the running car running drive device of the No. 1 lifting and walking trolley and the running trolley longitudinally movable control device of the No. 2 lifting and walking trolley, such that the No. 1 lifting and walking trolley, the connecting truss beam, and the running car of the No. 2 lifting and walking trolley move in a direction of the main line track; stopping operating when they arrive at the longitudinal movement stop position of the running car of the No. 2 lifting and walking trolley; locking such that a horizontal projection of the running car in this case completely enters over the main line track;

(6) operating the horizontally extendable vertical supporting structure of the No. 2 lifting and walking trolley, such that the horizontally extendable vertical supporting structure retracts and the running car of the No. 2 lifting and walking trolley stably falls on the inside of the gear on the main line track; continuing to operate the horizontally extendable vertical supporting structure of the No. 2 lifting and walking trolley, such that the horizontally extendable vertical supporting structure completely retracts back to the upper stop position, then stopping operating, and locking;

(7) synchronously operating track running control devices of the No. 1 and No. 2 lifting and walking trolleys, such that the novel track layer returns to a position where a newly conveyed track section is received; preparing for next track section hoisting work; and

D. track section re-hoisting, transporting and mounting works of the novel track layer

repeating all the operations of step A-step C to complete track section re-hoisting, transportation and mounting and positioning of the novel track layer, and so on to complete the track construction.

The specific construction method is as follows: a transfer work for working surfaces of the novel track layer, when there is a need to transfer to the new working surface after the completion of one working surface of the track construction, there are several cases: 1, a working position of another construction line in the same direction; 2, a working position of the other two construction lines in the opposite directions; the transfer of the novel track layer is realized by the traction of the track towing vehicle through a layed first track switch and a second track switch; the transfer of the work surface is carried out according to the following steps:

(1) transfer to a working position in the construction site of another line in the same direction: withdrawing horizontal extension devices of the vertical supporting structures of the No. 1 and No. 2 lifting and walking trolleys of the novel track layer back to a running transfer position; withdrawing the vertical supporting structures back to an upper limit transfer running position, and locking; dismounting a power supply of the novel track layer, and rolling a cable into the cable reel; disconnecting the track running wheels of the novel track layer from the running drive speed reducer, such that they are at a neutral gear; connecting the novel track layer and the track towing vehicle with a connecting towing bar; starting the track towing vehicle to tow the novel track layer to run to a second track switch slowly; towing the novel track layer by the track towing vehicle to pass through the second track switch firstly; when the tail of the novel track layer arrives at a track switch annunciator and stops running, pulling the first track switch and the second track switch to open a lateral passage track of the track switches; starting the track towing vehicle, such that the track towing vehicle pushes the novel track layer to pass through the second track switch and the first track switch and to enter the main line and to arrive at a new working surface to complete the transfer work;

(2) transfer to a new working surface in a reverse direction: withdrawing horizontal extension devices of the vertical supporting structures of the No. 1 and No. 2 lifting and walking trolleys of the novel track layer back to a running transfer position; withdrawing the vertical supporting structures back to an upper limit transfer running position, and locking; dismounting the power supply of the novel track layer, and rolling the cable into the cable reel; disconnecting the track running wheels of the novel track layer from the running drive speed reducer, such that they are at a neutral gear; connecting the novel track layer and the track towing vehicle with a connecting towing bar; starting the track towing vehicle to tow the novel track layer to run to the second track switch slowly; towing the novel track layer by the track towing vehicle to pass through the second track switch firstly; when the tail of the novel track layer arrives at the track switch annunciator and stops running, pulling the first track switch and the second track switch to open a lateral passage track of the track switches; starting the track towing vehicle, such that the track towing vehicle pushes the novel track layer to pass through the second track switch and the first track switch and to enter the main line; when the tail of the track towing vehicle arrives at an annunciator of the first track switch and stops running, disconnecting the novel track layer from the track towing vehicle; starting the track towing vehicle to open lateral passage, and returning; when the tail of the track towing vehicle arrives at a fouling point indicator position of the first track switch and stops, pulling the first track switch to recover forward passage; starting the novel track layer to run towards a working surface; when the tail of the novel track layer arrives the fouling point indicator position of the first track switch after passing through the first track switch, and stops, pulling the first track switch to open lateral passage; starting the track towing vehicle to run towards the main line; when the tail of the track towing vehicle arrives at the annunciator of the first track switch and stops, pulling the first track switch to recover forward passage; starting the track towing vehicle to pass through the first track switch and approach to the novel track layer slowly, and stopping after the track towing vehicle arrives at the fouling point indicator position of the first track switch; connecting the track towing vehicle and the novel track layer with a connecting towing bar; after correct connection, starting the track towing vehicle to push the novel track layer to a new working surface to complete the transfer work; and

(3) transfer to a new working surface in a reverse direction: withdrawing horizontal extension devices of the vertical supporting structures of the No. 1 and No. 2 lifting and walking trolleys of the novel track layer back to the running transfer position; withdrawing the vertical supporting structures back to the upper limit transfer running position, and locking; dismounting the power supply of the novel track layer, and rolling the cable into the cable reel; disconnecting the track running wheels of the novel track layer from the running drive speed reducer, such that they are at a neutral gear; connecting the novel track layer and the track towing vehicle with a connecting towing bar; starting the track towing vehicle to tow the novel track layer to run to the second track switch slowly; when the head of the novel track layer arrives at a fouling point indicator position of the second track switch and stops, disconnecting the novel track layer from the track towing vehicle; starting the track towing vehicle to continuously run forward; when the tail of the track towing vehicle arrives at an annunciator position of the second track switch and stops, pulling the second track switch to open lateral passage; starting the track towing vehicle to run reversely; when the tail of the trail towing vehicle arrives at the fouling point indicator position of the second track switch and stops, pulling the second track switch to recover forward passage; starting the novel track layer to run towards a new working surface; when the tail of the novel track layer arrives at the annunciator of the second track switch and stops, pulling the second track switch to recover lateral passage; starting the track towing vehicle to approach to the novel track layer slowly, and then stopping; connecting the track towing vehicle and the novel track layer with a connecting towing bar; after correct connection, starting the track towing vehicle to push the novel track layer to a new working surface to complete the transfer work.

Compared with the prior art, the present invention has the following advantages:

1. the novel track layer adopts a combined symmetrical structure type which may be an assembly module capable of being assembled or disassembled, thus bringing convenience for operation, driving, transportation and transfer transportation;

2. the novel track layer is electrically driven and shares power with other works of track construction to save energy resources, and the entire vehicle is light in weight and more prominent in environmental protection advantage;

3. the novel track layer walks on the main line track, without the need to pave a temporary track, such that the working efficiency is higher, and therefore the novel track layer is applied more widely in a section free of the main line track due to the adoption of crawler running;

4. the novel track layer does not use a temporary auxiliary track, such that the construction procedures are decreased, the construction investment and construction cost are reduced, and the potential safety hazards during construction are reduced;

5. the novel track layer walks on the main line track, and the pavement of the temporary running track is canceled completely so as not to occupy the structure space of a track bed, such that once construction of track bed concrete is realized, the concrete construction quality is improved, and the phenomenon of water seepage at a track bed construction joint is solved; and

6. the novel track layer walks on the main line track, is not affected by structural sections and is suitable for various working conditions of track laying. Due to adoption of the truss beam for hoisting, the working space is large and the lifting capacity is large. The lifting and walking trolleys which adopt a horizontally extendable structure design can be used for hoisting ultra-wide materials such as a pre-assembled track switch, accompanied with wide applicability and strong versatility.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view of a novel track layer in an embodiment of the present invention.

FIG. 2 is a side view of the novel track layer in the embodiment of the present invention.

FIG. 3 is a schematic diagram of a connecting hoisting truss beam in the embodiment of the present invention.

FIG. 4 is a schematic diagram of the connecting hoisting truss beam in the embodiment of the present invention.

FIG. 5 is a schematic diagram of a track running car in the embodiment of the present invention.

FIG. 6 is a side view of the track running car in the embodiment of the present invention.

FIG. 7 is a schematic diagram of a crawler running mechanism in the embodiment of the present invention.

FIG. 8 is a side view of the crawler running mechanism in the embodiment of the present invention.

FIG. 9 is a side view of the crawler running mechanism in the embodiment of the present invention.

FIG. 10 is a schematic diagram of a horizontal frame beam of the lifting and walking trolley in the embodiment of the present invention.

FIG. 11 is a side view of the horizontal frame beam of the lifting and walking trolley in the embodiment of the present invention.

FIG. 12 is a schematic diagram of a horizontal extension structure of a vertical support in the embodiment of the present invention.

FIG. 13 is a schematic diagram of a guide sleeve and guide column structure of the vertical support in the embodiment of the present invention.

FIG. 14 is a side view of the extendable guide sleeve and guide column structure of the vertical support in the embodiment of the present invention.

FIG. 15 is a schematic diagram of guide columns and guide sleeves of the vertical support in the embodiment of the present invention.

FIG. 16 is a schematic diagram of a vertically extendable guide column mechanism in the present embodiment of the present invention.

FIG. 17 is an assembled schematic diagram of the horizontally extendable guide column and the horizontal frame beam in the present embodiment of the present invention.

FIG. 18 is a structural schematic diagram of a hoisting car in the embodiment of the present invention.

FIG. 19 is a schematic diagram in which a cable reel and a hydraulic pump station are mounted in the embodiment of the present invention.

FIG. 20 is a schematic diagram in which a track towing vehicle pushes the novel track layer to arrive at a working surface in the embodiment of the present invention.

FIG. 21 is a schematic diagram in which the track towing vehicle conveys a track section in the embodiment of the present invention.

FIG. 22 is a schematic diagram in which the novel track layer lifts to an upper working point and then waits for being fed with the track section in the embodiment of the present invention.

FIG. 23 is a side view in which the novel track layer lifts to the upper working point and then waits for being fed with the track section in the embodiment of the present invention.

FIG. 24 is a schematic diagram in which the track towing vehicle pushes the track section and a transport truck to perform a feeding operation in the embodiment of the present invention.

FIG. 25 is a schematic diagram in which the track section enters a space below the novel track layer completely to complete the feeding operation in the embodiment of the present invention.

FIG. 26 is a side view in which the track section completely enters a space below the novel track layer to complete the feeding operation in the embodiment of the present invention.

FIG. 27 is a schematic diagram in which a hoisting car of the novel track layer hoists the track section in the embodiment of the present invention.

FIG. 28 is a side view of an operation in which the hoisting car of the track layer hoists the track section in the embodiment of the present invention.

FIG. 29 is a schematic diagram in which the track towing vehicle tows a flat truck to exit from a space below the novel track layer in the embodiment of the present invention.

FIG. 30 is a schematic diagram in which the novel track layer entirely lowers and the track running car falls on the main line track in the embodiment of the present invention.

FIG. 31 is a schematic diagram in which the track layer hoists the track section to run towards a designed mounting position in the embodiment of the present invention.

FIG. 32 is a side view in which the novel track layer hoists the track section to run towards the designed mounting position in the embodiment of the present invention.

FIG. 33 is a side view in which the novel track layer hoists the track section to pass through a track section temporary support section in the embodiment of the present invention.

FIG. 34 is a schematic diagram in which the novel track layer hoists a prefabricated track plate in the embodiment of the present invention.

FIG. 35 is a side view in which the novel track layer hoists the prefabricated track plate in the embodiment of the present invention.

FIG. 36 is a schematic diagram in which the novel track layer module is split and then lifts the running car to realize loading and long-distance transfer in the embodiment of the present invention.

FIG. 37 is a schematic diagram in which the novel track layer module is split and then continuously hoists the truss beam to realize loading and long-distance transfer in the embodiment of the present invention.

In drawings, reference symbols represent the following components: 1. vertical supporting structure of running car; 2. crawler running mechanism; 3. upper reinforcing structure of horizontal frame beam; 4. horizontal frame beam; 5. running car; 6. track running wheel; 7. second hydraulic drive cylinder; 8. connecting truss beam; 9. hoisting car; 10. sliding roller; 11. vertical supporting device of running car; 12. hinging device for running car and connecting truss beam; 13. guide sleeve device for running car to slide longitudinally; 14. crawler running lifting device; 15. guide column structure of vertical support; 16. single-roller of connecting crossbeam; 17. electric hoist of hoisting car; 18. third hydraulic drive cylinder; 19. running wheels of hoisting car; 20. hydraulic drive cylinder of vertical support; 21. running drive sprocket of running car; 22. crawler running mechanism; 23. rotary disk; 24. extendable conveyer belt fixing device; 25. extendable guide sleeve; 26. guide sleeve for hoisting car; 27. rotating disk; 28. guide sleeve for running car; 29. running wheel axle of running car; 30. structural reinforcing rib plate of running car; 31. hinging base; 32. guide column; 33. crawler towing wheel; 34. crawler running guide wheel; 35. crawler running thrust wheel; 36. crawler running drive wheel; 37. upper reinforcing structure of horizontal frame beam; 38. hydraulic drive cylinder of horizontal extension device of vertical support; 39. second guide column; 40. vertical guide sleeve; 41. hydraulic drive cylinder of vertical supporting device; 42. hydraulic drive cylinder of first-stage guide column of vertical supporting device; 43. second-stage guide column of vertical supporting device; 44. guide column of vertical supporting device; 45. towing and connecting hook for track layer; 46. power cable reel; 47. windlass; 48. pulley block; 49. hydraulic pump station; 50. running drive motor; 51. crawler running drive motor; 52. track section supporting device; 53. driving ball pin.

DETAILED DESCRIPTIONS OF THE PREFERRED EMBODIMENTS

The present invention will now be further described in conjunction with the accompanying drawings, the structure and principle of which are well understood by those skilled in the art. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

The main technical solution of the present invention lies in that: the complete machine of the novel track layer is designed in such a manner that two front and rear lifting and walking trolleys having a lifting function are connected by a connecting truss beam; the novel track layer is arranged symmetrically in front and rear, walks on a main line track in a section having the main line track, and walks on a structural floor in a section free of the main line track; each lifting and walking trolley has horizontally extendable and vertically liftable supporting structures, which are required for the novel track layer to load or unload a track material and switch running mechanisms; the connecting truss beam has a function of connecting the two lifting and walking trolleys together to form a complete machine. Secondly, hoisting cars for hoisting materials, such as a track section are mounted on the connecting truss beam. The hoisting car is towed by a windlass to walk back and forth along the truss beam to achieve precise lifting and positioning of the track material. The construction method comprises the following steps: when the novel track layer unloads the track section from a track section truck, operating horizontally extension and vertical supporting control devices of the lifting and walking trolleys firstly so as to lift the whole novel track layer to a height at which the track material is hoisted and unloaded; pushing a flat truck that transports the track material to a position under the connecting truss beam of the novel track layer; lifting up the track material, such as the track section, by the hoisting car to leave from the flat trunk and a material supporting cushion; enabling the flat truck to exit from the position below the novel track layer; operating the vertical supporting control device of the lifting and walking trolley to enable the novel track layer to descend together with the track section and other materials, such that the running car of the novel track layer falls on the main line track stably to finish unloading; when the novel track layer walks to the vicinity of a mounting position along the main line track and the front lifting and walking trolley arrives at a stop at the end of the main line track, operating the vertical supporting control device of the lifting and walking trolley to make the running car away from the track; operating a longitudinal movement control device of the lifting and walking trolley to move the running car out of the main line track; operating a crawler running control device to enable the crawler running mechanism to descend and to be supported on the structural floor; recovering a lifting mechanism to an initial retraction position “0”; enabling the novel track layer to continue to walk forward to a designed mounting position of the track section, and then unloading the track section and other track materials; connecting steel rails and mounting a temporary track section support to fix a newly mounted track section; reversely operating control devices for lifting, mechanism switching and longitudinal movement of the novel track layer to return the novel track layer to the main line track; enabling the track layer to continue to walk towards a track section hoisting position in next time to arrive at an unloading place; and hoisting the track section to the next cycle.

Referring to FIGS. 1-37, a track layer for urban track transit engineering comprises lifting and walking trolleys, a connecting truss beam (8), crawler running mechanisms (2) and supporting structures. The novel track layer consists of two lifting and walking trolleys and the connecting truss beam (8) connecting the two lifting and walking trolleys. Each lifting and walking trolley consists of a running car (5), and a horizontal frame beam (4) for the running car to move longitudinally. The supporting structure capable of horizontally extending to both sides of a main line track and having the vertical lifting and walking trolley is mounted at the front and rear ends of the horizontal frame beam (4) respectively; each running car consists of a frame structure, track running wheels (6), and the crawler running mechanism (22) mounted in the center of a planar frame structure of the running car. The novel track layer walks on the main line track through the track walking wheels in a section having the main line track, and walks on the structural floor through the crawler running mechanisms in a section free of the main line track. Each horizontally extendable and vertically liftable supporting structure is used for the conversion of the novel track layer between the section having the main line track and the section free of the main line track.

Referring to FIGS. 1-37, a latch hook for connecting the novel track layer and a towing vehicle is mounted outside the horizontal frame beam (4). A hydraulic pump station (49) and a power supply cable reel (46) which are used for hydraulic operation of the lifting and walking trolley are mounted on an upper reinforcing structure frame (3) of the horizontal frame beam. The two lifting and walking trolleys are connected by the connecting truss beam (8) together to form a complete machine. A hoisting car (9) for hoisting materials is mounted on the connecting truss beam. The hoisting car is towed by a windlass to walk back and forth along the truss beam to achieve precise lifting and positioning of track materials.

Referring to FIGS. 1-37, the horizontal frame beam (4) consists of a plurality of longitudinal beams, a plurality of crossbeams and an upper reinforcing structure (3). Each longitudinal beam acts both as a structural beam of the horizontal frame beam and as a guide column for the running car to move back and forth. Each crossbeam acts both as a structural beam of the horizontal frame beam and as a guide sleeve structure for a vertical supporting structure of the lifting and walking trolley to extend horizontally and laterally. A reinforcing structure is mounted on the upper part of the horizontal frame beam to ensure the longitudinal rigidity and the lateral rigidity of the horizontal frame beam. A horizontal extension mechanism perpendicular to a line direction is mounted in each crossbeam. Each horizontal extension mechanism consists of a guide column (39) and a vertical guide sleeve (40). The horizontal extension mechanisms cooperate by means of the guide columns (39) and the guide sleeve (25). Horizontal and lateral extension is achieved by a hydraulic drive cylinder. The vertical supporting structure consisting of a second guide column, a first guide column and a first hydraulic drive cylinder is mounted in each guide sleeve (40). The second guide column acts as a guide sleeve of the first guide column. The vertical supporting structure is realized in such a manner that the first hydraulic drive cylinder (41) drives the first guide column and the second guide column to extend step by step.

Referring to FIGS. 1-37, the running car consists of a frame structure, track running wheels and a crawler running mechanism mounted in the center of a planer frame structure of the running car. The frame structure consists of two guide sleeves, track running wheels and a connection structure component. The running car is sleeved on a horizontal frame beam of the lifting and walking trolley through the guide sleeves. Forward and backward movements of the running car along the horizontal frame beam is achieved by a second hydraulic drive cylinder (7). The track running wheels of the running car are driven by a motor to walk on the main line track. The crawler running mechanism is mounted in the center of the upper plane of the running car and is fixed on a lower structural floor of the running car through a rotary disk. The crawler running mechanism extends upwards and downwards through the extendable guide sleeve (24) and guide columns (32). The extendable guide sleeves (24) are fixed on the rotary disk (23). A steering drive ball pin is mounted on the upper plane of the rotary disk (23). Upward and downward extension of the guide columns (32) is achieved by a third hydraulic drive cylinder (18). The crawler running mechanism is connected with the guide columns through a pin shaft. The crawler running mechanism consists of a chassis, a driving wheel, a guide wheel, a thrust wheel, a towing wheel and a crawler, and a hydraulic drive motor. A rotating disk (27) capable of rotating around the center of the running car is further mounted on the upper plane of the running car. The rotating disk rotates around the center of the running car through a roller. A hinging base (31) is mounted on the rotating disk (27) and is connected to the connecting truss beam (8) through a hinge pin.

Referring to FIGS. 1-37, the connecting truss beam (8) is formed by welding steel tubes, is divided into three sections and has a cross-section shaped as a Chinese character “Yi” (chair) and is arranged symmetrically in left and right sides. The three sections are connected by connecting pins. A track for the hoisting car (9) to walk is mounted on the connecting truss beam. A windlass (47) and a pulley block (48) are mounted at two ends of the connecting truss beam and used for towing the hoisting car to move back and forth along the track. A hydraulically driven hydraulic pump station (49) and a cable reel (46) are mounted on the upper reinforcing structure of the horizontal frame beam of the hoisting and walking trolley and used for providing hydraulic pressure and electric power for the novel track layer.

The construction technical solution in the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Example I: Construction Preparation, Track Section Hoisting and Mounting Works of the Novel Track Layer

1. Switching of the Novel Track Layer from a Running State to a Track Section Hoisting State.

Referring to FIGS. 1-6, the main structure design of the present invention lies in that: the novel track layer consists of two lifting and walking trolleys and a connecting hoisting truss beam.

Referring to FIGS. 5-20, each lifting and walking trolley consists of a horizontal frame beam and a running car. The horizontal frame beam consists of two longitudinal beams, four crossbeams and an upper reinforcing structure (37). Each of the two longitudinal beams acts both as a structural beam of the horizontal frame beam and as a guide column for the running car to move back and forth. Each crossbeam acts both as a structural beam of the horizontal frame beam and as a guide sleeve structure for a vertical supporting structure of the lifting and walking trolley to extend horizontally and laterally. A reinforcing structure (37) is mounted on the upper part of the horizontal frame structure to ensure the longitudinal rigidity and the lateral rigidity of the horizontal frame beam. A horizontal extension mechanism perpendicular to a line direction is mounted in each crossbeam. Each horizontal extension mechanism consists of a guide column (39) and a vertical guide sleeve (40). The horizontal extension mechanisms cooperate by means of the guide columns (39) and the guide sleeves (25). Horizontal and lateral extension is achieved by a hydraulically driven cylinder. The vertical supporting structure consisting of a second-stage guide column (43), a first-stage guide column (44) and a first hydraulic drive cylinder (41) is mounted in each guide sleeve (40), wherein the second-stage guide column acts as a guide sleeve of the first-stage guide column. The vertical support is realized in such a manner that the hydraulic drive cylinder drives the first-stage guide column and the second-stage guide column to extend step by step. The running car consists of a frame structure, track running wheels and a crawler running mechanism mounted in the center of a planer frame structure of the running car. The frame structure consists of two guide sleeves, track running wheels 6 and a connection structure component. The running car is sleeved on the horizontal frame beam (4) of the lifting and walking trolley through the guide sleeves (28). Forward and backward movements of the running car along the horizontal frame beam (4) is achieved by a second hydraulic drive cylinder (7). A wheel distance of the running wheels of the running car on the track is 1508 mm. The track running wheels of the running car are driven by a motor to walk on the main line track. A crawler running device (22) is mounted in the center of the upper plane of the running car and is fixed on a lower structural floor of the running car (5) through a rotary disk (23). The crawler running device (22) extends upwards and downwards through guide sleeves and guide columns (32). The extendable guide sleeves are fixed on the rotary disk (23). A steering drive ball pin (53) is mounted on the upper plane of the rotary disk (23). Upward and downward extension of the guide columns (32) is achieved by a second hydraulic drive cylinder (18). The crawler running devices (22) are connected through pin shafts and the guide columns (32). Each crawler running device (22) consists of a chassis, a crawler running driving wheel (36), a crawler running guide wheel (34), a crawler running thrust wheel (35), a crawler towing wheel (33) and a crawler running driving motor (51). A rotating disk (27) capable of rotating around the center of the running car is further mounted on the upper plane of the running car (5). The rotating disk rotates around the center of the trolley through a roller. A hinging base (31) is mounted on the rotating disk (27) and is connected to the connecting truss beam (8) through a hinge pin.

A. Lifting of the Novel Track Layer

referring to FIGS. 3-10, running the novel track layer to a position where it is ready to unload, and stopping; operating hydraulic drive cylinders of the lifting and walking trolleys respectively, such that horizontally extendable guide columns of the vertical supporting devices extend towards two sides of the line; when the internal space extending from the same section meets the requirement on the widths of a flat truck and the track section, stopping and locking; operating the hydraulic drive cylinders of the vertical supporting device respectively to drive the guide columns to extend downwards, such that they are stably supported on a concrete track bed (if the position of the track bed is not suitable, adjusting the horizontal extension outwards to an appropriate position, and padding if the floor is uneven); if appropriate, synchronously operating the vertical supporting devices of the No. 1 and No. 2 lifting and walking trolleys to extend downward under the constraint of the track bed surface, such that the novel track layer enters an upward-lift state; when the novel track layer is lift to a height at which the track section material on the flat truck is hoisted, and then stopping lifting; locally adjusting the stress state of eight support feet of the novel track layer, such that they are stressed uniformly, and the novel track layer enters a horizontal state; and then stopping operating, and locking.

B. Adjustment of Position of the Hoisting Car and the Height of the Hoisting Carrying-Pole:

referring to FIGS. 20-30, operating a running towing windlass of the hoisting car, such that the hoisting and walking trolley runs to a desired hoisting position of the hoisting truss beam; adjusting the height of the hoisting carrying-pole by the hoisting device so as to satisfy feeding passage of a track section transport vehicle.

2. Track Section Feeding, Novel Track Layer Hoisting, and Lowering of the Novel Track Layer to the Main Line Track

a. referring to FIGS. 10-37, directing a track towing vehicle to push the flat truck that transports the track section to slowly enter a space under the novel track layer;

b. referring to FIGS. 10-37, stopping pushing when the track section completely enters the space under the novel track layer, and braking;

c. referring to FIGS. 10-37, operating running and towing windlasses of the hoisting cars respectively to adjust the hoisting points of the hoisting cars, and stopping operating if they are in place;

d. operating the cars respectively to put hoisting carrying-poles down, such that carrying-pole hooks are firmly connected with the track section;

e. referring to FIGS. 10-37, relieving the constraint to the track section on the flat truck after everything is confirmed; synchronously operating the hoisting car, such that the hoisting car hoists the track section on the flat truck slowly; stopping operating when the track section is completely separated from the flat truck and a bogie support that supports the track section; checking whether the track section and a reinforcement cage thereof are separated from a supporting cushion and whether they are higher than the supporting cushion to affect running; adjusting the height of an individual component, and locking after everything is confirmed;

f. referring to FIGS. 10-37, directing the track towing vehicle to tow the flat truck to slowly exit from the space under the novel track layer; accelerating when the flat truck is completely separated from the space below the novel track layer, such that the track towing vehicle runs back to a base, and then loading a track section again; and

g. referring to FIGS. 10-37, synchronously operating hydraulic drive cylinders of the vertical supporting devices of the No. 1 and No. 2 lifting and walking trolleys of the novel track layer to drive the guide columns to retract backwards, such that the novel track layer descends slowly; parking the track running wheels of the running cars of the No. 1 and No. 2 lifting and walking trolleys of the novel track layer on the main line track stably; continuously retracting the hydraulic cylinders such that eight support feet are separated from the concrete track bed and ascend to an upper stop position; stopping operating, and locking.

3. Forward Moving of the Novel Track Layer, Running Device Switching and In-Placing Mounting of the Track Section:

a. operating the hoisting cars 9 respectively to adjust the height of the track section away from the main line track, so as not to affect normal running of the new track layer;

b. referring to FIGS. 10-37, synchronously operating track running drive motors of the No. 1 and No. 2 lifting and walking trolleys of the novel track layer, such that the novel track layer hoists the track section to move to a designed mounting position along the main line track;

c. referring to FIGS. 10-37, when the No. 2 lifting and walking trolley of the novel track layer arrives at a gear at the end of the main line track, stopping operating; operating the horizontal frame beam of the vertical support of the No. 2 lifting and walking trolley to move longitudinally the hydraulic drive cylinder 7, such that the horizontal frame beam of the vertical support moves entirely to the direction in which no main line track is arranged (relative to the running car 5); stopping operating when the horizontal frame beam moves to a stop position;

d. referring to FIGS. 10-37, operating a vertical support control system of the No. 2 lifting and walking trolley, such that a lower support foot of the vertical support is stably supported on an interval structural floor (which is not padded at ordinary time); continuously operating to lift the running car 5 to away from the tread of the main line track by a certain height (higher than the gear height), and then stopping operating;

e. referring to FIGS. 10-37, synchronously operating the horizontal frame beam of the vertical support of the No. 2 lifting and walking trolley to move the hydraulic cylinder 7 and a running device of the No. 1 lifting and walking trolley longitudinally, such that the novel track layer hoists the track section to move towards a direction in which no main line track is arranged; when the running car 5 of the No. 2 lifting and walking trolley entirely moves out of the main line track, stopping operating;

f. referring to FIGS. 10-37, operating a crawler running device lifting control device hidden in the middle of the running car 5 of the No. 2 lifting and walking trolley, such that the track running device 22 descends slowly and is stably supported on the structural floor, and stressed uniformly; then stopping operating;

g. referring to FIGS. 10-37, operating a vertical support control device of the No. 2 lifting and walking trolley, such that the vertical support retracts upwards slowly away from the floor by a certain height (without affecting running of the novel track layer), and then stopping operating;

h. referring to FIGS. 10-37, synchronously operating a running control device of the No. 1 lifting and walking trolley and a crawler running control device of the No. 2 lifting and walking trolley, such that the novel track layer runs in a direction in which no main line track is arranged, the No. 1 lifting and walking trolley of the novel track layer in this case walks on the main line track, and the No. 2 lifting and walking trolley walks on the structural floor; when working on a curved section, operating a crawler running steering control device 53 of the No. 2 trolley to adjust a walking direction;

i. referring to FIGS. 10-37, stopping running when a horizontal projection position of the end (close to the No. 1 lifting and walking trolley) of the track section hoisted by the novel track layer is exactly aligned to the end of the mounted track section based on visual inspection; synchronously operating the hoisting car 9 to lower the track section (longitudinally moving the hoisting car such that the track section is aligned accurately if the joint alignment has a deviation), such that the rail tread of the track section is basically in a designed mounting position; and

j. referring to FIGS. 10-37, connecting a steel rail of the newly mounted track section and a joint of the originally mounted track section with a joint splint; mounting a temporary support or a track state adjusting support on the newly mounted track section according to a designed spacing to fix the track section; after the track section is fixed, lowering a hook of the hoisting car 9, removing a track section carrying-pole, and lifting the track section carrying-pole to a highest point, and then stopping operating.

4. Running Mechanism Switching of the Novel Track Layer and Returning to an Unloading Site of the Original Track Section:

a. synchronously operating a control device for the running device of the No. 1 lifting and walking trolley and a control device for the crawler running device of the No. 2 lifting and walking trolley, such that the novel track layer walks on the main line track; and stopping running when a crawler running surface approaches to the end of the newly mounted track section;

b. referring to FIGS. 10-37, operating the longitudinally movable hydraulic cylinder 7 of the horizontal frame beam of the vertical support of the No. 2 lifting and walking trolley, such that the horizontal frame beam moves towards the direction of the main line track, and stopping while arriving at a stop position;

c. referring to FIGS. 10-37, operating the vertical support control device of the No. 2 lifting and walking trolley, such that the vertical support is supported on the structural floor; continuously operating until the lower tread of a track running wheel of the running car 5 is higher than an upper tread of the steel rail of the newly mounted track section based on visual inspection, and then stopping operating;

d. referring to FIGS. 10-37, operating a crawler lifting control device of the No. 2 lifting and walking trolley, such that the crawler running device 22 retracts upwards back to an internal upper stop point of the running car 5, then stopping operating, and locking;

e. referring to FIGS. 10-37, synchronously operating the running car control device of the No. 1 lifting and walking trolley and a longitudinally movable control device of the horizontal frame beam of the vertical support of the No. 2 lifting and walking trolley, such that the novel track layer moves in a direction of the main line track; stopping operating when a horizontal projection of the running car 5 of the No. 2 lifting and walking trolley entirely enters into the track end of the newly mounted track section;

f. referring to FIGS. 10-37, operating a vertical support control device of the No. 2 lifting and walking trolley to lower the lifting and walking trolley, such that the running car stably falls on the steel rail tread of the main line track; continuing to operate until the vertical support retracts back to the upper stop position, and then stopping operating; and g. referring to FIGS. 10-37, synchronously operating running control devices of the running cars 5 of the No. 1 and No. 2 lifting and walking trolleys, such that the novel track layer runs to the original track section unloading position along the main line track; and stopping running after the novel track layer arrives at a track section unloading position.

5. Re-Hoisting and Unloading of a New Track Section:

repeating all the steps in 1, 2, 3, and 4 above to complete the unloading and mounting of the new track section, and repeating the above steps continuously to complete the laying operation of the track.

Example II: Hoisting and Mounting Construction of Prefabricated Track Plate of the Novel Track Layer

the laying construction of an urban rail transit track bed is generally carried out after the construction of an interval track bed cushion is completed. The track bed plate is a prefabricated concrete plate generally having a length of 5800 mm (normal version). A curved controlling plate generally has a length of 4500 m to 5000 mm. In order to transport the prefabricated plate conveniently, it is general to mount a steel rail fastener in time after a track bed plate of 25 m to 50 m is layed, to form a transport passage. When the track plate is layed to over 100 m, the track plate and the track state are adjusted. The track plate and the track state are fixed by pouring self-compacting concrete or other mortar material under the track plate to form a track line. Therefore, the laying of the track plate is a key procedure.

1. Unloading, Hoisting, Moving and Positioning of the Track Plate:

a. lifting of the novel track layer: referring to FIGS. 10-38, running the novel track layer to a position where it is ready to unload (the No. 1 lifting and walking trolley of the novel track layer is at a position where the track plate has been mounted and which is 5 m away from the end of the steel rail of the main line track, and the No. 2 lifting and walking trolley is at a position where a cushion at which the track plate is not mounted), and stopping; operating hydraulic drive cylinders 38 of the No. 1 and No. 2 lifting and walking trolleys respectively, such that horizontally extendable guide columns 39 of the vertical supporting devices extend towards two sides of the line; when the internal space extending from the same section meets the requirement on the widths of the flat truck and the track section, stopping running, and locking; operating the hydraulic drive cylinders 41, 42 of the vertical supporting devices of the No. 1 and No. 2 lifting and walking trolleys respectively to drive the guide columns 43, 44 to extend downwards, such that they are stably supported on a cushion surface (if the position of the cushion surface is not suitable, adjusting the horizontal extension outwards to an appropriate position, and padding if the floor is uneven); if appropriate, continuing to synchronously operate the vertical supporting devices of the No. 1 and No. 2 lifting and walking trolleys to extend downward under the constraint of the cushion surface, such that the novel track layer enters an upward-lift state; when the novel track layer is lift to a height at which the track plate on the flat truck is hoisted, then stopping lifting; adjusting the stress state of eight support feet of the novel track layer, such that they are stressed uniformly, and the novel track layer enters a horizontal state; and then stopping operating, and locking;

b. adjustment of position of the hoisting car 9 and the height of the hoisting carrying-pole: referring to FIGS. 10-38, operating a running towing windlass 47 of the hoisting car 9, such that the hoisting and walking trolley 9 runs to a desired hoisting position of the hoisting truss beam; adjusting the height of the hoisting carrying-pole by a hoisting device so as to satisfy feeding passage of a track section transport vehicle.

2. Feeding, Hoisting, Moving and Mounting of the Track Plate:

a. referring to FIGS. 10-37, directing the track towing vehicle to push the flat truck that transports the track plate to slowly enter a space under the novel track layer;

b. referring to FIGS. 10-37, stopping pushing when the track plate completely enters the space under the novel track layer, and braking;

c. referring to FIGS. 10-37, operating running and towing windlasses 47 of the hoisting cars respectively to adjust the hoisting point positions of the hoisting cars 9, and stopping operating if everything is confirmed;

d. operating the cars 9 respectively to put hoisting carrying-poles down, such that carrying-pole hooks are firmly connected with the track plate;

e. referring to FIGS. 10-37, relieving the constraint to the track plate on the flat truck after everything is confirmed; synchronously operating the hoisting car 9, such that the hoisting car hoists the track plate on the flat truck slowly; stopping operating when the track plate is completely separated from the flat truck and a crosser that supports the track plate; checking whether the track plate is separated from the supporting cushion and whether it is higher than the supporting cushion to affect running; adjusting the height of an individual component, and locking after everything is confirmed;

f. referring to FIGS. 10-37, synchronously operating a movement control device of the hoisting car such that the hoisting car hoists the track plate to move towards a mounting direction along the connecting truss beam (see FIG. 54); stopping moving when it arrives at a position over the mounting position; operating the hoisting car to hoist and control the track plate to descend slowly and place it on the mounting position stably; moving the hoisting car such that the track is in place accurately;

g. referring to FIGS. 10-37, disconnecting the hoisting carrying-pole from the track plate after the track plate is placed; synchronously lifting the hoisting carrying-pole to an upper limit height; synchronously moving the hoisting car to the track plate on the flat truck, and continuing to hoist the next track plate;

h. repeating the steps c, d, e, f and g to complete hoisting of the second track plate, the third track plate, etc.;

i. stopping operating after the track plates under the novel track layer are mounted completely;

j. referring to FIGS. 10-37, directing the track towing vehicle to convey a temporary steel rail for the main line to a position under the novel track layer;

k. referring to FIGS. 10-37, synchronously operating the hoisting car 9 to hoist the steel rail and longitudinally moving the steel rail to the mounting position of the track plate, lowering the steel rail slowly and stably and placing it on a rail ditch baseplate of the track plate; and

l. referring to FIGS. 10-37, fastening the steel rail with a fastener in accordance with regulations, such that the steel rails in the main line form a passage.

3. Forward Moving and Lifting of the Novel Track Layer, and Preparing for Hoisting in a New Position:

a. referring to FIGS. 10-37, synchronously operating hydraulic drive cylinders 41, 42 of the vertical supporting devices of the No. 1 and No. 2 lifting and walking trolleys of the novel track layer to drive the guide columns 43, 44 to retract backwards, such that the novel track layer descends slowly; parking the track running wheels of the running car 5 of the No. 1 lifting and walking trolley of the novel track layer on the main line track stably, and stopping operating; operating the crawler running mechanism of the No. 2 lifting and walking trolley, such that it descends stably and is supported on the cushion surface layer; continuing to operate vertical support control devices of the No. 1 and No. 2 lifting and walking trolleys such that eight support feet are separated from the cushion surface layer and retract to an upper stop position; stopping operating, and locking.

b. synchronously operating the running control device of the novel track layer such that the novel track layer runs towards a direction in which no track plate is arranged; stopping running when the running car of the No. 1 lifting and walking trolley is 5 m away from the end of the steel rail of the main line track;

c. synchronously operating the vertical supporting devices of the No. 1 and No. 2 lifting and walking trolley such that the support feet are supported on the cushion surface layer stably; continuing to operate such that the entire novel track layer is lift to a position where the track plate is hoisted, and stopping operating; leveling the novel track layer such that it is in a horizontal state; checking whether the eight support feet of the novel track layer are supported stably; and locking after everything is conformed; and

d. repeating the steps 1, 2, and 3 to complete the next hoisting and steel rail mounting works of the track plate; and finally completing the laying work of the track plates.

Example III: Transfer of Working Surfaces of the Novel Track Layer

Referring to FIGS. 20-37, the track construction is generally centered on a track-laying base, and upper and lower lines are constructed in both directions. The track switch as key equipment for track steering is constructed in advance. The transfer of working surfaces of the novel track layer is realized by layed track switches and single crossovers. There are three positions in working surface transfer, on the way to a new working surface 1, a new working surface 2 and a new working surface 3:

1. withdrawing horizontal extension devices of the vertical supporting devices of the No. 1 and No. 2 lifting and walking trolleys of the novel track layer back to a running transfer position; withdrawing the vertical supporting device back to an upper limit transfer running position, and locking; dismounting a power supply of the novel track layer, and rolling a cable into the cable reel; disconnecting the track running wheels of the novel track layer from a running drive speed reducer, such that they are at a neutral gear; connecting the novel track layer and the track towing vehicle with a connecting towing bar; starting the track towing vehicle to tow the novel track layer to run to a track switch position 2 slowly; towing the novel track layer by the track towing vehicle to pass through the track switch 2 firstly; when the tail of the novel track layer arrives at an annunciator of the track switch 2 and stops running, pulling the track switch 1 and the track switch 2 to open a lateral passage track at the track switch side; starting the track towing vehicle, such that the track towing vehicle pushes the novel track layer to pass through the track switch 1 and the track switch 2 and to enter the main line 1 and to arrive at the new working surface 1 to complete the transfer work;

2. referring to FIGS. 20-37, withdrawing horizontal extension devices of the vertical supporting structures of the No. 1 and No. 2 lifting and walking trolleys of the novel track layer back to a running transfer position; withdrawing the vertical supporting structures back to an upper limit transfer running position, and locking; dismounting the power supply of the novel track layer, and rolling the cable into the cable reel; disconnecting the track running wheels of the novel track layer from the running drive speed reducer, such that they are at a neutral gear; connecting the novel track layer and the track towing vehicle with a connecting towing bar; starting the track towing vehicle to tow the novel track layer to run to the track switch 2 slowly; towing the novel track layer by the track towing vehicle to pass through the track switch 2 firstly; when the tail of the novel track layer arrives at the annunciator of the track switch and stops running, pulling the track switch 1 and the track switch 2 to open a lateral passage track at the track switch side; starting the track towing vehicle, such that the track towing vehicle pushes the novel track layer to pass through the track switch 2 and the track switch 1 and to enter the main line 1; when the tail of the track towing vehicle arrives at the annunciator of the track switch 1 and stops running, disconnecting the novel track layer from the track towing vehicle; starting the track towing vehicle to open lateral passage, and returning; when the tail of the track towing vehicle arrives at a fouling point indicator position of the track switch 1 and stops, pulling the track switch 1 to recover forward passage; electrifying the novel track layer to run towards a working surface; when the tail of the novel track layer arrives the fouling point indicator position of the track switch 1 after passing through the track switch 1, and stops, pulling the track switch 1 to open lateral passage; starting the track towing vehicle to run towards the main line; when the tail of the track towing vehicle arrives at the annunciator of the track switch 1 and stops, pulling the track switch 1 to recover forward passage; starting the track towing vehicle to pass through the track switch 1 and approach to the novel track layer slowly, and stopping after the track towing vehicle arrives at the fouling point indicator position of the track switch 1; connecting the track towing vehicle and the novel track layer with a connecting towing bar; after correct connection, starting the track towing vehicle to push the novel track layer to the new working surface 2 to complete the transfer work; and

3. referring to FIGS. 20-37, withdrawing horizontal extension devices of the vertical supporting structures of the No. 1 and No. 2 lifting and walking trolleys of the novel track layer back to the running transfer position; withdrawing the vertical supporting structures back to the upper limit transfer running position, and locking; dismounting the power supply of the novel track layer, and rolling the cable into the cable reel; disconnecting the track running wheels of the novel track layer from the running drive speed reducer, such that they are at a neutral gear; connecting the novel track layer and the track towing vehicle with a connecting towing bar; starting the track towing vehicle to tow the novel track layer to run to the track switch 2 slowly; when the head of the novel track layer arrives at a fouling point indicator position of the track switch 2 and stops, disconnecting the novel track layer and the track towing vehicle; starting the track towing vehicle to continuously run forward; when the tail of the track towing vehicle arrives at an annunciator of the track switch 2 and stops, pulling the track switch 2 to open lateral passage; starting the track towing vehicle to run reversely, and stopping when the tail of the track towing vehicle arrives at the fouling point indicator position of the track switch 2; pulling the track switch 2 to recover forward passage; starting the novel track layer to run towards the new working surface 4; when the tail of the novel track layer arrives at the annunciator of the track switch 2 and stops, pulling the track switch 2 to recover lateral passage; starting the track towing vehicle to approach to the novel track layer slowly, and then stopping; connecting the track towing vehicle and the novel track layer with a connecting towing bar; after correct connection, starting the track towing vehicle to push the novel track layer to the new working surface 3 to complete the transfer work. 

What is claimed is:
 1. The track layer for urban track transit engineering, comprising lifting and walking trolleys, a connecting truss beam, crawler running mechanisms and supporting structures, wherein the novel track layer consists of two lifting and walking trolleys and a connecting truss beam connecting the two lifting and walking trolleys; each lifting and walking trolley consists of a running car, and a horizontal frame beam for the running car to move longitudinally; the supporting structure capable of horizontally extending to both sides of a main line track and having the vertical lifting and walking trolley is mounted at the front and rear ends of the horizontal frame beam respectively; each running car consists of a frame structure, track running wheels, and the crawler running mechanism mounted in the center of a planar frame structure of the running car; the novel track layer walks on the main line track through the track walking wheels in a section having the main line track, and walks on a structural floor through the crawler running mechanisms in a section free of the main line track; each horizontally extendable and vertically liftable supporting structure is used for the switching of the novel track layer between the section having the main line track and the section free of the main line track.
 2. The novel track layer for urban track transit engineering according to claim 1, wherein a latch hook by which the novel track layer and a towing vehicle are connected is mounted outside the horizontal frame beam; a hydraulic pump station and a power supply cable reel which are used for hydraulic operation of each lifting and walking trolley are mounted on an upper reinforcing structure frame of the horizontal frame beam; the two lifting and walking trolleys are connected by the connecting truss beam together to form a complete machine; a hoisting car for hoisting materials is mounted on the connecting truss beam; the hoisting car is towed by a windlass to walk back and forth along the truss beam to achieve precise lifting and positioning of track materials.
 3. The novel track layer for urban track transit engineering according to claim 1, wherein the horizontal frame beam consists of a plurality of longitudinal beams, a plurality of crossbeams and an upper reinforcing structure; each longitudinal beam acts both as a structural beam of the horizontal frame beam and as a guide column for the running car to move back and forth; each crossbeam acts both as a structural beam of the horizontal frame beam and as a guide sleeve structure for a vertical supporting structure of the lifting and walking trolley to extend horizontally and laterally; a reinforcing structure is mounted on the upper part of the horizontal frame beam to ensure the longitudinal rigidity and the lateral rigidity of the horizontal frame beam; a horizontal extension mechanism perpendicular to a line direction is mounted in each crossbeam; each horizontal extension mechanism consists of a guide column and a vertical guide sleeve; the horizontal extension mechanisms cooperate by means of the guide columns and the guide sleeve structures; horizontal and lateral extension is achieved by a hydraulic drive cylinder; the vertical supporting structure consisting of a second guide column, a first guide column and a first hydraulic drive cylinder is mounted in each guide column, wherein the second guide column acts as a guide sleeve of the first guide column; the vertical supporting structure is realized in such a manner that the first hydraulic drive cylinder drives the first guide column and the second guide column to extend step by step.
 4. The novel track layer for urban track transit engineering according to claim 1, wherein the running car consists of a frame structure, track running wheels and a crawler running mechanism mounted in the center of a planer frame structure of the running car; the frame structure consists of two guide sleeves, track running wheels and a connection structure component; the running car is sleeved on the horizontal frame beam of the lifting and walking trolley through the guide sleeves; forward and backward movements of the running car along the horizontal frame beam is achieved by a second hydraulic drive cylinder; the track running wheels of the running car are driven by a motor to walk on the main line track; the crawler running mechanism is mounted in the center of the upper plane of the running car and is fixed on a lower structural floor of the running car through a rotary disk; the crawler running mechanism extends upwards and downwards through the guide sleeve and the guide column; the extendable guide sleeve is fixed on the rotary disk; a steering drive ball pin is mounted on the upper plane of the rotary disk; upward and downward extension of the guide column is achieved by a third hydraulic drive cylinder; the crawler running mechanism is connected with the guide column through a pin shaft; the crawler running mechanism consists of a chassis, a driving wheel, a guide wheel, a thrust wheel, a towing wheel and a crawler, and a hydraulic drive motor; a rotating disk capable of rotating around the center of the running car is further mounted on the upper plane of the running car; the rotating disk rotates around the center of the car through a roller; a hinging base is mounted on the rotating disk and is connected to the connecting truss beam through a hinge pin.
 5. The novel track layer for urban track transit engineering according to claim 1, wherein the connecting truss beam is formed by welding steel tubes, is divided into three sections and has a cross-section shaped as a Chinese character “Yi” (chair) and is arranged symmetrically in left and right sides; the three sections are connected by connecting pins; a track for the hoisting car to walk is mounted on the connecting truss beam; a windlass and a pulley block are mounted at two ends of the connecting truss beam and used for towing the hoisting car to move back and forth along the track; a hydraulically driven hydraulic pump station and a cable reel are mounted on the upper reinforcing structure of the horizontal frame beam of the hoisting and walking trolley and used for providing hydraulic pressure and electric power for the novel track layer.
 6. A construction method of the novel track layer for urban track transit engineering according to claim 1, the construction method for the track layer comprises the following steps: when the novel track layer unloads a track section from a track section truck, operating horizontally extendable and vertical supporting structures of each lifting and walking trolley firstly so as to lift the whole novel track layer to a height at which a track material is hoisted and unloaded; pushing a flat truck that transports the track material to a position under the connecting truss beam of the novel track layer; lifting up the track material by the hoisting car to leave from the flat trunk and a material supporting cushion; enabling the flat truck to exit from the position below the novel track layer; operating the vertical supporting structure of the lifting and walking trolley to enable the novel track layer to descend together with the track material, such that the running car of the novel track layer falls on the main line track stably to finish unloading; when the novel track layer walks to the vicinity of a mounting position along the main line track and the front lifting and walking trolley arrives at a gear at the end of the main line track, operating the vertical supporting structure of the lifting and walking trolley to make the running car away from the track; operating a longitudinal movement control device of the lifting and walking trolley to move the running car out of the main line track; operating a crawler running control device to lower the crawler running mechanism and to be supported on the structural floor; recovering a lifting mechanism to an initial retraction position; enabling the novel track layer to continue to walk forward to a designed mounting position of the track section, and then unloading the track material; connecting steel rails and mounting a temporary track section support to fix a newly mounted track section; reversely operating control devices for lifting, mechanism switching and longitudinal movement of the novel track layer to return the novel track layer to the main line track; enabling the track layer to continue to walk towards a track section hoisting position in next time to arrive at an unloading place; and hoisting the track section to the next cycle
 7. The construction method of the novel track layer for urban track transit engineering according to claim 6, the specific construction method is as follows: A. lapping, hoisting and transporting works of track sections (1) operating the novel track layer to a track section unloading position; operating horizontally extendable vertical supporting structures of the No. 1 lifting and walking trolley and the No. 2 lifting and walking trolley respectively to make the vertical supports to extend to two sides of a line, with an extension distance satisfying the width and safety distance requirements of the flat truck for track section transportation and the loaded material; and performing a locking operation after the safety is ensured; (2) operating the horizontally extendable vertical supporting structures of the No. 1 lifting and walking trolley and the No. 2 lifting and walking trolley respectively to make the vertical supports to extend downwards; enabling a lower support foot plate of each vertical support to be stably supported on the track bed that has reached a desired strength, or the structural floor, and ensuring the force to be distributed uniformly; synchronously continuing to operate the horizontally extendable vertical supporting structures of the No. 1 lifting and walking trolley and the No. 2 lifting and walking trolley respectively to make the vertical supports continuously extend downwards; since the counteraction of the support from the floor makes the No. 1 lifting and walking trolley and the No. 2 lifting and walking trolley and the connecting hoisting truss beam to lift slowly upwards, stopping operating after the hoisting height is reached, re-checking whether the vertical supporting structures of the lifting and walking trolleys are stably supported and stressed uniformly, and then locking; (3) directing a track towing vehicle to push the flat truck that transports the track material to slowly enter a position under the novel track layer, and stopping pushing and performing parking brake when the track section completely enters the space under the connecting hoisting truss beam; (4) operating hoisting cars on the crossbeams of the connecting truss beam of the novel track layer respectively to be aligned to hoisting-point positions at which the track material is hoisted; lowering a hoisting carrying-pole to connect a hook and the track section; operating the hoisting cars respectively such that they are stressed at hoisting points; re-checking vertical support feet of the novel track layer to ensure that they are firm; synchronously operating the hoisting cars to hoist the track material slowly; stopping lifting after the track material is completely detached from the fulcrum on a bogie supporting structure on the flat truck by a safety distance, and performing a locking operation; starting the track towing vehicle to make it tow the flat truck slowly to drive away from the new track layer by a certain distance, and then stopping or returning to a base for transportation of the next track section; (5) synchronously operating the horizontally extendable vertical supporting structures of the No. 1 and No. 2 lifting and walking trolleys reversely such that the vertical supports retract upwards, so that the No. 1 and No. 2 lifting and walking trolleys in this case descend to the main line track slowly together with the connecting truss beam and the hoisted track material; continuously operating the horizontally extendable vertical supporting structures of the No. 1 and No. 2 lifting and walking trolleys reversely such that the vertical supports retract upwards and return to a transfer state of the novel track layer; performing a locking operation; adjusting the horizontally extendable vertical supporting structures of the No. 1 and No. 2 lifting and walking trolleys, such that a distance between the vertical support feet having the unified cross-section is greater than the width of the track material; (6) operating a running device control system of the novel track layer such that the novel track layer hoists the track material to run to a designed mounting position along the main line track, and the novel track layer hoists the track material to pass through a section at which concrete pouring has been completed, a section at which no concentrate is poured and a section at which the track section is adjusted and fixed, and arrives at the end of the main line track; (7) stopping running when the running car of the No. 2 lifting and walking trolley of the novel track layer arrives at a gear position at the end of the main line track; B. running mechanism switching, moving and track section positioning works of the novel track layer (1) when the running car of the No. 2 lifting and walking trolley of the novel track layer arrives at a gear at the end of the main line track and stops running, operating a longitudinal movement control device of the running vehicle of the No. 2 lifting and walking trolley, such that the horizontal frame structure of the lifting and walking trolley moves to a horizontal movement stop position relative to the running car in a direction in which no main line track is arranged, and stopping operating; (2) operating the horizontally extendable vertical supporting structure of the No. 2 lifting and walking trolley to extend downward; enabling a lower support foot plate of the horizontally extendable vertical support to be stably supported on the structural floor, and ensuring the force to be distributed uniformly; continuing to operate the running car of the No. 2 lifting and walking trolley to lift upwards away from the tread of the main line track and to be higher than a gear height; then stopping lifting, and locking; (3) synchronously operating a running car running drive device of the No. 1 lifting and walking trolley and a running wheel longitudinally movable control device of the No. 2 lifting and walking trolley, such that the No. 1 lifting and walking trolley, the connecting truss beam, the track material and the running car of the No. 2 lifting and walking trolley move in a direction in which no main line track is arranged; stopping operating when they arrive at a running car longitudinally movable stop position of the No. 2 lifting and walking trolley; locking such that a horizontal projection of the running car is completely out of the main line track; (4) operating a crawler running mechanism lifting device in the running car of the No. 2 lifting and walking trolley, such that the crawler running mechanism descends slowly and is stably supported on the structural floor and stressed; (5) operating the horizontally extendable vertical supporting structure of the No. 2 lifting and walking trolley, such that the horizontally extendable vertical supporting structure is completely separated from the structural floor by a certain height, then stopping operating, and locking; (6) synchronously operating the running car running control device of the No. 1 lift and walking trolley and the crawler running control device of the No. 2 lift and walking trolley, such that the novel track layer runs in a direction in which no main line track is arranged; operating a crawler running direction control device of the No. 2 lifting and walking trolley to adjust a running direction of the No. 2 lifting and walking trolley and to ensure that the No. 2 lifting and walking trolley walks on the central line of the track; when the No. 1 lifting and walking trolley approaches to the end of the main line track, stopping running; checking the horizontal projection position of the track section and the connected position of the end of the mounted track section; completing alignment by moving the hoisting car if there is a little deviation in position, or completing alignment by moving the novel track layer if there is a great deviation; (7) synchronously operating the hoisting car to lower the track section slowly to a designed mounting height; moving the hoisting car back and forth slightly; stopping operating after the newly mounted track section is aligned to the mounted track section; (8) fixedly connecting joints of steel rails with a steel rail splint; mounting a temporary support or a track state adjusting frame at a set position on the track section; screwing up an adjusting nut to fix a spatial position of the newly mounted track section; (9) operating a hoisting control device; disconnecting the hoisting carrying-pole from the track section; hoisting the hoisting carrying-pole to an upper limit position, and then stopping operating; C. running mechanism switching of the novel track layer to lapping and hoisting position (1) operating the novel track layer to run in a direction of the main line track, and stopping running when the end surface of the running crawler approaches to the end of the newly mounted track section; (2) operating the running car longitudinally movable control device of the No. 2 lifting and walking trolley, such that the horizontal frame structure of the lifting and walking trolley moves to a longitudinal movement stop position relative to the running car in a direction of the main line track, and stopping operating; (3) operating the horizontally extendable vertical supporting structure of the No. 2 lifting and walking trolley to extend downward; enabling the lower support foot plate of the horizontally extendable vertical supporting structure to be stably supported on the structural floor, and ensuring the force to be distributed uniformly; continuing to operate the running car of the No. 2 lifting and walking trolley to lift upwards to be higher than a gear height; then stopping lifting, and locking; (4) operating the crawler running mechanism lifting device in the running car of the No. 2 lifting and walking trolley, such that the crawler running mechanism lifts slowly and is stably retracted at an upper limit position inside the running car; stopping operating, and locking; (5) synchronously operating the running car running drive device of the No. 1 lifting and walking trolley and the running trolley longitudinally movable control device of the No. 2 lifting and walking trolley, such that the No. 1 lifting and walking trolley, the connecting truss beam, and the running car of the No. 2 lifting and walking trolley move in a direction of the main line track; stopping operating when they arrive at the longitudinal movement stop position of the running car of the No. 2 lifting and walking trolley; locking such that a horizontal projection of the running car in this case completely enters over the main line track; (6) operating the horizontally extendable vertical supporting structure of the No. 2 lifting and walking trolley, such that the horizontally extendable vertical supporting structure retracts and the running car of the No. 2 lifting and walking trolley stably falls on the inside of the gear on the main line track; continuing to operate the horizontally extendable vertical supporting structure of the No. 2 lifting and walking trolley, such that the horizontally extendable vertical supporting structure completely retracts back to the upper stop position, then stopping operating, and locking; (7) synchronously operating track running control devices of the No. 1 and No. 2 lifting and walking trolleys, such that the novel track layer returns to a position where a newly conveyed track section is received; preparing for next track section hoisting work; and D. track section re-hoisting, transporting and mounting works of the novel track layer repeating all the operations of step A-step C to complete track section re-hoisting, transportation and mounting and positioning of the novel track layer, and so on to complete the track construction.
 8. The construction method of the novel track layer for urban track transit engineering according to claim 6, wherein the specific construction method is as follows: a transfer work for working surfaces of the novel track layer, when there is a need to transfer to the new working surface after the completion of one working surface of the track construction, there are several cases: 1, a working position of another construction line in the same direction; 2, a working position of the other two construction lines in the opposite directions; the transfer of the novel track layer is realized by the traction of the track towing vehicle through a layed first track switch and a second track switch; the transfer of the work surface is carried out according to the following steps: (1) transfer to a working position in the construction site of another line in the same direction: withdrawing horizontal extension devices of the vertical supporting structures of the No. 1 and No. 2 lifting and walking trolleys of the novel track layer back to a running transfer position; withdrawing the vertical supporting structures back to an upper limit transfer running position, and locking; dismounting a power supply of the novel track layer, and rolling a cable into the cable reel; disconnecting the track running wheels of the novel track layer from the running drive speed reducer, such that they are at a neutral gear; connecting the novel track layer and the track towing vehicle with a connecting towing bar; starting the track towing vehicle to tow the novel track layer to run to a second track switch slowly; towing the novel track layer by the track towing vehicle to pass through the second track switch firstly; when the tail of the novel track layer arrives at a track switch annunciator and stops running, pulling the first track switch and the second track switch to open a lateral passage track of the track switches; starting the track towing vehicle, such that the track towing vehicle pushes the novel track layer to pass through the second track switch and the first track switch and to enter the main line and to arrive at a new working surface to complete the transfer work; (2) transfer to a new working surface in a reverse direction: withdrawing horizontal extension devices of the vertical supporting structures of the No. 1 and No. 2 lifting and walking trolleys of the novel track layer back to a running transfer position; withdrawing the vertical supporting structures back to an upper limit transfer running position, and locking; dismounting the power supply of the novel track layer, and rolling the cable into the cable reel; disconnecting the track running wheels of the novel track layer from the running drive speed reducer, such that they are at a neutral gear; connecting the novel track layer and the track towing vehicle with a connecting towing bar; starting the track towing vehicle to tow the novel track layer to run to the second track switch slowly; towing the novel track layer by the track towing vehicle to pass through the second track switch firstly; when the tail of the novel track layer arrives at the track switch annunciator and stops running, pulling the first track switch and the second track switch to open a lateral passage track of the track switches; starting the track towing vehicle, such that the track towing vehicle pushes the novel track layer to pass through the second track switch and the first track switch and to enter the main line; when the tail of the track towing vehicle arrives at an annunciator of the first track switch and stops running, disconnecting the novel track layer from the track towing vehicle; starting the track towing vehicle to open lateral passage, and returning; when the tail of the track towing vehicle arrives at a fouling point indicator position of the first track switch and stops, pulling the first track switch to recover forward passage; starting the novel track layer to run towards a working surface; when the tail of the novel track layer arrives the fouling point indicator position of the first track switch after passing through the first track switch, and stops, pulling the first track switch to open lateral passage; starting the track towing vehicle to run towards the main line; when the tail of the track towing vehicle arrives at the annunciator of the first track switch and stops, pulling the first track switch to recover forward passage; starting the track towing vehicle to pass through the first track switch and approach to the novel track layer slowly, and stopping after the track towing vehicle arrives at the fouling point indicator position of the first track switch; connecting the track towing vehicle and the novel track layer with a connecting towing bar; after correct connection, starting the track towing vehicle to push the novel track layer to a new working surface to complete the transfer work; and (3) transfer to a new working surface in a reverse direction: withdrawing horizontal extension devices of the vertical supporting structures of the No. 1 and No. 2 lifting and walking trolleys of the novel track layer back to the running transfer position; withdrawing the vertical supporting structures back to the upper limit transfer running position, and locking; dismounting the power supply of the novel track layer, and rolling the cable into the cable reel; disconnecting the track running wheels of the novel track layer from the running drive speed reducer, such that they are at a neutral gear; connecting the novel track layer and the track towing vehicle with a connecting towing bar; starting the track towing vehicle to tow the novel track layer to run to the second track switch slowly; when the head of the novel track layer arrives at a fouling point indicator position of the second track switch and stops, disconnecting the novel track layer from the track towing vehicle; starting the track towing vehicle to continuously run forward; when the tail of the track towing vehicle arrives at an annunciator position of the second track switch and stops, pulling the second track switch to open lateral passage; starting the track towing vehicle to run reversely; when the tail of the trail towing vehicle arrives at the fouling point indicator position of the second track switch and stops, pulling the second track switch to recover forward passage; starting the novel track layer to run towards a new working surface; when the tail of the novel track layer arrives at the annunciator of the second track switch and stops, pulling the second track switch to recover lateral passage; starting the track towing vehicle to approach to the novel track layer slowly, and then stopping; connecting the track towing vehicle and the novel track layer with a connecting towing bar; after correct connection, starting the track towing vehicle to push the novel track layer to a new working surface to complete the transfer work. 